Oven-thermometer.



E. L. BAKER.

OVEN THERMOMETER. APPLICATION FILED JAN'ZQ, ms.

Patented July 4, 1916.

Witnesses Attorneys EUGENE L. BAKER, or TAUNTON, MASSACHUSETTS.

oVEN-THERMOMETER.

Specification of Letters Patent.

Patented July 4, 1916.

Application filed January 29, 1916. Serial No. 75,098.

To all whom it may concern: 7

Be it known that I, EUGENE L. BAKER, a citizen of the United States, residing at Taunton, in the county of Bristol and State ofMassachusetts, have invented'a new and useful Oven-Thermometer, of which the following is a specification.

The device forming the subject matter of this application is a thermometer of that general type which is used in connection with an oven, and one object of the invention is to simplify and cheapen the cost of production of structures of this sort.

A further object of the invention is to provide novel means whereby the yoke which carries the actuating shaft and attendant parts may be attached readlly to the dial and be detached therefrom without the use of tools.

Another object of the invention is to provide novel means for connecting the thermometric spring with the yoke.

A further object of the invention is to provide novel means whereby accidental dis placements of one end of the thermometrlc spring will be avoided.

It is within the province ofthe disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawing :Figure 1 is a front elevation; Fig. 2 is a rear elevation wherein sundry parts are broken away; Fig. 3 is a bottom plan; Fig. 4 is a section taken parallel to the dial and passing through a portion of the yoke. Fig. 5 is a fragmental elevation showing a slight modification in the invention.

In carrying out the present invention there is provided a supporting structure in the form of a dial 1 equipped in its lower edge with a notch 2 defining spaced shoulders 3.

The invention comprises a loop-shaped,

front sections 7, fingers S, projecting forwardly from the front sections,'and a transverse, disk-like head 9 on one end of one of the fingers 8. v

Journaled for rotation in the back 5 of the yoke 4 and in the head 9 thereof is a shaft 10, provided within the contour of the yoke with a crank 11. The head 9 of the yoke and one end of the shaft 10 are located in front of the dial 1 and the said end of the shaft above mentioned is secured, as shown at 14 to an indicating arm 12 adapted to cooperate with a scale 24 (empirical or otherwise) inscribed on the forwardface of the dial 1.

The numeral 15 indicates a bimetallic, thermometric spring, the function and the operation of which is well understood in the art. The spring 15 is of U-shape and one arm thereof is twisted as shown at 16, so that one extremity of the spring, indicated at 1.7, lies substantially parallel to the dial 1, the other end 18 of the spring lying substantially at right angles to the dial. The end 17 of the spring 15 lies within the contour of the yoke, and the end 18 of the spring lies outside of the yoke, the end 17 being equipped with a notch 19 in which the crank 11 of the shaft 10 is received.

In the upper and lower edges of one of the sides 6 of the yoke 4, notches 20 and 21 are formed. The constituent material freed by the formation of the notches'20'and 21 is bent outwardly to form rivets for securing elements 22 which engage the end 18 of the spring 15 and hold the same against the outer face of that side 6 in which the notches 20 and 21 are formed.

So far as is concerned the structure above described, attention is directed to two features, namely the structure shown in Fig. 4,

wherein integral parts of the yoke 4 are made efficient as a means for holding the spring 15 in place and, secondly, the ease with which the yoke may be assembled with the dial 1, it being necessary merely to pinchthe side portions 6 of the yoke together and to insert the fingers 8 into the notch 2 in order to assemble the yoke with the dial.

As another and further improvement, it is to be noted, as shown at 23 in Fig. 4, that when the arm 12 lies at the zero end of the scale 24, the end 17 of the spring 15 enters to a slight extent into the notch 21.

Oven thermometers not infrequently are mounted upon the door and when the structure forming the subject matter of this application is so mounted, the end 17 of the spring 15 cannot slide along the crank 11, when the door is opened forcibly, or is slammed shut, because the end 17 of the spring is lodged as shown at 23 in the notch 21 when the arm 12 cooperates with the zero point of the scale 24.

In the modification shown in Fig. 5, the end 1'7" of the spring not only is provided with a central notch 19 but, as well, is provided with side notches 5O defining fingers 51 which may be bent outwardly in opposite directions. The crank 11 may be placed in any of the notches 19 or 50, such an ad justment being desirable at times in connection with dials, the zero points of which are not located at the same places on the seve 211 dials. Further, since three notches are provided for the reception of the crank, the position of the crank at the starting of the device may be regulated, thereby permitting the arm 12 to be located accurately at zero.

Having thus described the invention, what is claimed is 1. In an oven thermometer, a supporting structure having spaced shoulders; a resilient yoke embodying fingers yieldingly engaged with the shoulders to hold. the yoke assembled with the supporting structure; a shaft journaled for rotation in the yoke; an indicating arm carried by the shaft; and a thermometric spring forming a connection between the yoke and the shaft.

2. In an oven thermometer, a dial having an opening; a resilient yoke embodying a back, fingers yieldingly engaged. with the dial along the edges of the opening, and a transverse head carried by one finger and located upon the opposite side of the dial from the back; a shaft journaled for rotation in the back and in the head; an indicating arm carried by the shaft and coacting with the dial; and a thermometric spring forming a connection between. the shaft and the yoke.

3. In an oven thermometer, a supporting structure having spaced shoulders; a resilient yoke embodying fingers yieldingly en-- gaged With the shoulders to hold the yoke assembled with the supporting structure; a shaft journaled in the yoke; an indicating arm carried by the shaft; and a thermometric spring operatively connected with the shaft; a portion of the yoke being pro vided with an opening, the material freed in the formation of the opening being formed into a securing clement integral with the yoke and Connected to the spring.

4. In an oven thermometer, a dial; a yoke supported by the dial; a shaft journalod in the yoke; an indicating arm carried by the shaft and coacting with the dial; a thermometric spring, one end of which is operatively connected with the shaft, the yoke being provided with an opening into which said end, of the spring is adapted to retire when the indicating arm is near zero, the material freed in the formation of the opening being fashioned into a securing element integral with the yoke and connected with the other end of the spring.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

EUGENE L. BAKER. Witnesses RICHARD IVAsrrcoArr, HENRY A. TUTTLE.

Copies of this patent may be obtained for five cent: each, by addressing the Comminioncr of Patents,

Washington, I). G." 

